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Round|Natural|GIA

1.23ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 3495150691

Certificate GIA 3495150691

Diamond specifications and retailer prices

From £1,563 GBP
$2,094 USD
As of October 26, 2026
Save £2,163 GBP (58%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £3,726 GBP at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 1.23ct natural round diamond

This 1.23ct natural round sits in the classic one-carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 3495150691. Listed at 16 retailers as of October 26, 2026, with prices from £1,563 to £3,726, a £2,163 spread on the same certified stone. NZ Jewellers lists it at £3,726. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.23
Carat
I
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 3495150691
Dimensions6.87 × 6.85 × 4.24 mm
L/W Ratio1.00
Star length50%
Lower girdle80%
Top View
6.87 mm6.85 mm1.23 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 3495150691
Side View
Table 58.0%Crown 35°Girdle: MED-STKPavilion 41°Culet: NoneDepth 61.7%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 26
Current: £3,726 GBP|Low: £1,508 GBP|High: £3,726 GBP|Avg: £2,044 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
October 30, 2026
Retailer 14£1,563 GBP
Retailer 15£1,609 GBP
Retailer 12£1,634 GBP
Retailer 13£1,644 GBP
Retailer 7£1,660 GBP
Retailer 16£1,711 GBP
Retailer 4£1,782 GBP
Retailer 6£1,782 GBP
Retailer 3£1,864 GBP
Retailer 8£1,886 GBP
Retailer 9£1,893 GBP
Retailer 11£2,043 GBP
Retailer 5£2,056 GBP
Retailer 2£2,225 GBP
Retailer 10£3,138 GBP
NZ Jewellers£3,726 GBP

39 data points across 16 retailers

16 retailers£1,563 GBP to £3,726 GBP

A
Cheapest Retailer
-
£1,563 GBP
$2,094 USD
A
Retailer 2
-
£1,609 GBP
$2,156 USD
View
A
Retailer 3
-
£1,634 GBP
$2,190 USD
View
Retailer 4
-
£1,642 GBP
$2,200 USD
View
Price last confirmed 37 days ago
A
Retailer 5
-
£1,644 GBP
$2,203 USD
View
Final sale: no returns
Retailer 6
-
£1,711 GBP
View
Price last confirmed 31 days ago
A
Retailer 7
-
£1,782 GBP
$2,388 USD
View
A
Retailer 8
-
£1,782 GBP
$2,388 USD
View
A
Retailer 9
-
£1,864 GBP
$2,498 USD
View
A
Retailer 10
-
£1,886 GBP
$2,527 USD
View
A
Retailer 11
-
£1,893 GBP
View
A
Retailer 12
-
£2,043 GBP
View
A
Retailer 13
-
£2,056 GBP
$2,755 USD
View
B+
Retailer 14
-
£2,225 GBP
€2,839 EUR
View
B+
Retailer 15
-
£3,138 GBP
View
Most Expensive
B
NZ Jewellers
236d964f-82f4-49e9-ab05-5e8201d80b69 · Oct 30
£3,726 GBP
$4,992 USD
View
15 more retailers have this diamond
Prices start from £1,563 GBPSave up to £2,163 GBP

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
1.23ct Round
£1,563 GBP